1 cruise (first)
My favorite part was being able to see and do so many things in so many countries. Favorite excursions included light house tour in Denmark, kayaking in Norway, Hermitage Museum Impressionist art in St. Petersburg, and cycling in Estonia. I would not recommend the Famous Helsinki Ice Bar in Helsinki.
The service on the ship was phenomenal! It never felt like there were 900 people on board. There is plenty of space for relaxing alone-- it never felt crowded. Excursions were well planned.
I would definitely recommend Viking.